New extension icons

• New pixel icons made for the extension
• Added some screenshots of extension in use

Full Changelog: 0.0.4...0.0.5

Change start date to end date

• Start date/time is now the same as the end date/time

Full Changelog: 0.0.3...0.0.4

Reduce bundle size

• Move library out of src and only copy over relevant files

Full Changelog: 0.0.2...0.0.3

Fix button breaking

• Fix button breaking if assignment has no date
  • Button now only generates if assignment has start/due date

Full Changelog: 0.0.1...0.0.2

Initial working release

• Adds calendar button to all courses user is enrolled in as a student on gradescope.com
• Button to the right of date column
• Default styling on calendar button